Toy building brick



FIG. 1 is a top front isometric view of a toy building brick showing my new design, a bottom rear isometric view being a mirror image thereof;

FIG. 2 is a right side view of the toy building brick, a left side, front side and rear side each being mirror images thereof;

FIG. 3 is a bottom view of the toy building brick, a top view being a mirror image thereof; and,

FIG. 4 is a cross-sectional view of the toy building brick taken along line 4-4 to show a depth of openings into the toy building brick. 

CLAIM The ornamental design for a toy building brick, as shown and described. 